基于多功能数据采集卡低频电磁场发生器的研制  

Design of low frequency electromagnetic field generator based on multifunction data acquisition card

作　　者：朱汉明[1] 许伟成[2] 白文芳[2] 

机构地区：[1]暨南大学物理系暨南大学思源实验室,广东广州510632 [2]广东省人民医院/广东省医学科学院广东省老年医学研究所康复医学科,广东广州510080

出　　处：《中国医学物理学杂志》2016年第11期1168-1173,共6页Chinese Journal of Medical Physics

基　　金：国家青年自然科学基金(81301680);广东省科技计划项目(2012B061700059;2016A020214014)

摘　　要：目的：为研究低频电磁场细胞生物学效应,根据亥姆霍兹线圈原理设计制作实验用低频交变电磁场发生器。方法：利用计算机、数据采集卡、功率放大器和亥姆霍兹线圈等组成均匀磁场发生器,将数据采集卡产生的波形信号调理并放大后,驱动亥姆霍兹线圈产生均匀可调控的磁场,通过计算机实时显示和储存磁场频率、场强、作用时间及波形等参数,用于磁场定量干预实验研究。结果：该仪器产生的磁场输出波形包括正弦波、三角波和方波,频率为0~500Hz,磁感应强度在0~10mT范围内连续可调,可调精度0.1 mT,可设置不同输出模式（输出时间、间歇时间等）,持续工作2h无热辐射。结论：该实验研制的低频交变电磁场发生器可满足实验设计要求,输出不同波形,实时显示记录作用频率、场强和作用时间等。Objective To study on the cell biological effect in low frequency electromagnetic field by designing a low frequency alternating electromagnetic field generator based on the principle of Helmholtz coil. Methods The uniform electromagnetic field generator was composed of a computer, data acquisition card, power amplifiers and Helmholtz coil. After processing and magnifying the waveform signal produced by the data acquisition card, the Helmholtz coil was driven to generate uniform adjustable magnetic fields. Parameters of electromagnetic field, such as field frequency, field intensity, intervention time and waveform were real-time displayed and stored in computer for the quantitative experimental study of magnetic field intervention. Results The output waveform of the generator includes sine wave, triangular wave and square wave, with the frequency of 0-500 Hz. The continuously adjustable magnetic induction intensity was 0-10 mT, with an adjustable precision of 0.1 mT. The generator which could work continuously for 2 h without thermal radiation had different output modes to be set, such as output time and time interval. Conclusion The generator can meet different research requirements, including different kinds of output waveforms, real-time displaying and recording the frequency, field intensity and intervention time.

关 键 词：低频电磁场 发生器 物理治疗 数据采集卡 

分 类 号：R312[医药卫生—基础医学] TM154[电气工程—电工理论与新技术]